Why not just a big Yellow Star?
Saying you “identify” as vaccinated is throwing this nonsense back in the left’s face. Who are they to say that we can’t identify as whatever we want? They do it.
Or a red scarf, armband, suit pin, etc.
People love their symbols.
In the words of George Carlin: “I leave symbols for the symbol minded.”
That said, here in America, where you once had privacy and a republic (rights), you generally were not forced to play along with every dipshit fad thought up by some activist or politician. But not today.
Today they are putting the gun to your head and demanding conformity for the “greater good, vaterland, whatever...” At least with global warming they didn’t coerce you to play along, but I guess that’s no fun for those assholes dreaming up the next emergency we all need to submit to.